From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753803AbaGHJHA (ORCPT ); Tue, 8 Jul 2014 05:07:00 -0400 Received: from a.ns.miles-group.at ([95.130.255.143]:65276 "EHLO radon.swed.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752691AbaGHJG7 (ORCPT ); Tue, 8 Jul 2014 05:06:59 -0400 Message-ID: <53BBB4AF.1080507@nod.at> Date: Tue, 08 Jul 2014 11:06:55 +0200 From: Richard Weinberger User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Konstantin Khlebnikov CC: Andrew Morton , "x86@kernel.org" , Linux Kernel Mailing List , UML devel , linux-kbuild Subject: Re: [uml-devel] [PATCH] checkstack: use $UTS_MACHINE as target architecture References: <20140705112238.16142.42735.stgit@zurg> <20140707150523.cc671116bf366e8db73209c5@linux-foundation.org> <53BBA9B4.7050609@nod.at> <53BBACF4.4070800@nod.at> <53BBB0F2.20109@nod.at> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 08.07.2014 11:03, schrieb Konstantin Khlebnikov: > I know. But debugging/profiling of kernel code is much easier when it > runs in userspace. > I think this is the last use case where uml might beat normal hardware > accelerated qemu/kvm. > But without SMP and with that high overhead on each syscall and > context/mm switch it's mostly useless. The major use case of UML is that you can run it on hardware without KVM support. Everyone else is using KVM. Thanks, //richard